Skip to main content Accessibility help
×
Home

Ambient temperature synthesis of polycrystalline thin films of lithium cobalt oxide with controlled crystallites orientations

  • R.B. Goldner (a1), P. Zerigian (a1), T.Y. Liu (a1), N. Clay (a1), F. Vereda (a1) and T.E. Haas (a1)...

Abstract

Polycrystalline thin films of lithium cobalt oxide (nominally LiCo02) have been deposited by a process which we have named, ion beam directed assembly (IBDA). It is similar to ion assisted deposition (IAD) or ion beam assisted deposition (IBAD), but the major difference is that in IBDA the ion beam directs, via the vector momenta of the ions, rather than merely assists, the growth. Hence, we also term the process directed assembly to distinguish it from self assembly. Also, in directed assembly the ions may or may not become an integral part of the film's composition.

In this paper we wish to show that the IBDA process may be capable of controlling microstructure, e.g., in the case of polycrystalline films, control the orientations of the crystallites. For LiCoO2 we have observed this in two ways - by X-ray analysis, and electrochemically, by lithium diffusivity measurements. In particular, we have observed increased lithium diffusivities (≥ 10−8 cm 2/s) in IBDA deposited films as compared to that found for rf sputter deposited films (z 10−10 cm2/s). In addition, the coulometric titration characteristics of an IBDA deposited Lil−yCoO2 are very similar to those of sputtered deposited films (for lithium extraction/insertion, y ≤0.5, and for quasi-equilibrium voltages up to 4.2 volts).

Copyright

References

Hide All
1. Bates, J.B. et al. , Solid State Ionics 70/71,619 (1994); and B. Wang, et al., J.Electrochem.Soc. 10, 3203 (1996).
2. Julien, C. and Nazri, C.A., Solid State Batteries: Materials Design and Optimization, Kluwer Academic Publishers, Boston (1994).
3. Goldner, R.B. et al. , Proc. Electrochem.Soc., PV 95–22, 173 (1996).
4. See., e.g., Cuomo, J.J. et al. , Handbook of Ion Beam Processing Technology Noyes Publications, Park Ridge, NJ (1989); and R.J. Culbertson, Materials Synthesis and Processing Using Ion Beams Materials Research Society Symposium Proceedings, vol. 316 (1993). (Note that crystal orientation effects in films deposited by use of an assisting ion beam were reported in these two references.)
5. The alumina substrates were donated by Lucent Technologies, thanks to D.Krause.
6. Goldner, R.B. et al. , J.Electrochem.Soc. 143, L129 (1996).
7. Warren, B.E., “X-Ray Diffraction,” p. 252, Dover Publications, Inc., NY (1990)].
8. Thomas, M.G.S.R. et al. , Solid State Ionics 17, 13 (1985).
9. Gummow, R.J. et al. , Mat. Res. Bull. 28, 235 (1993).

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed